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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7ae3140bf07bac76f558b5d09ae265042ac638c62a3233afbd004b23073497' 
  AND token = 'FG3egCsNGiebH2hPC0XY6EHOKOh7Qm6ltG2GFbYxJIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}